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Testing of models of stomatal ozone fluxes with field measurements in a mixed Mediterranean forest
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SYSNO ASEP 0384491 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Testing of models of stomatal ozone fluxes with field measurements in a mixed Mediterranean forest Author(s) Fares, S. (IT)
Matteucci, G. (IT)
Mugnozza, S. (IT)
Morani, A. (IT)
Calfapietra, Carlo (UEK-B) RID, SAI, ORCID
Salvatori, E. (IT)
Fusaro, L. (IT)
Manes, F. (IT)
Loreto, F. (IT)Number of authors 9 Source Title Atmospheric Environment. - : Elsevier - ISSN 1352-2310
Roč. 67, MAR (2013), s. 242-251Number of pages 10 s. Language eng - English Country GB - United Kingdom Keywords Ozone fluxes ; Stomatal conductance models ; GPP ; Mediterranean forest Subject RIV EH - Ecology, Behaviour Institutional support RVO:67179843 - RVO:67179843 UT WOS 000315173300028 DOI 10.1016/j.atmosenv.2012.11.007 Annotation Mediterranean forests close to urban areas are exposed to polluted plumes loaded with tropospheric ozone. This is the case of Castelporziano Estate, a 6000 ha Mediterranean forest 25 km from Rome downtown on the coast of the Mediterranean Sea. In September 2011 we started an intensive field campaign aimed at investigating ozone deposition from a mixed Mediterranean forest, mainly composed by Quercus suber, Quercus ilex, Pinus pinea. Measurements at canopy level with the eddy covariance technique were supported by a vegetation survey and the measurement of all environmental parameters which allowed to calculate stomatal ozone fluxes. Leaf-level measurements were used to parameterize models to calculate stomatal conductance based on a Jarvis-type and Ball–Berry approach. We show changes in magnitude of ozone fluxes from a warm (September) to a cold period (October–December). Stomatal component explained almost the totality of ozone fluxes during the cold days, but contributed only up to 50% to total ozone deposition during warm days, suggesting that other sinks (e.g. chemistry in the gas-phase) play a major role. Modeled stomatal ozone fluxes based on a Jarvis-type approach (DO3SE) correlated with measured fluxes better than using a Ball–Berry approach. A third model based on a modified Ball–Berry equation was proposed to account for the non-linear dependency of stomatal conductance on relative humidity. This research will help the development of metrics for ozone-risk assessment and advance our understanding of mixed Mediterranean forests in biosphere–atmosphere exchange. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2014
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